Listing B. Domain layer for SET game—algorithmic design.

Java Primer
The Game of SET & Software Design
Vince Huston
Listing B. Domain layer for SET game—algorithmic design.


// Domain layer for SET game - algorithmic design

import java.util.Random;

class Card {
  private static boolean[] used = new boolean[27];
  private static Random    rn   = new Random();

  private int   number;  ///// 0..26
  private int[] facets = new int[3];

  public Card() {
    number = rn.nextInt(27);
    while ( used[number] )
      number = rn.nextInt(27);
    used[number] = true;
    facets[0] = number % 3;
    facets[1] = number % 9 / 3;
    facets[2] = number / 9;
  }
  public int getFacet( int i ) { return facets[i]; }
  public int getNumber()       { return number;   }
  public String toString() {
    return "" + (number+1) + '-' + facets[0] + facets[1] + facets[2];
} }

class Set {
  private Card[] cards = new Card[3];
  public Set( Card one, Card two, Card thr ) {
    cards[0] = one;  cards[1] = two;  cards[2] = thr;
  }
  public boolean isValid() {
    int sum;
    for (int i=0; i < 3; i++) {
      sum = 0;
      for (int j=0; j < cards.length; j++)
        sum += cards[j].getFacet(i);
      if (sum % 3 != 0) return false;
    }
    return true;
} }

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